"KKL.] 
MISSISSIPPI. 
209 
The following four analyses, by Prof. W. F. Hand, State chemist, 
■e of samples of limestone from various points in Oktibbeha County, 
iss. : 
Analyses of Selma limestone from Oktibbeha County, Miss. 
ica (Si0 2 ) 
umina (A1 2 3 ) 
)n oxide (Fe 2 3 ) 
me carbonate ( CaC0 3 ) 
agnesium carbonate (MgC0 3 
ater 
2. 89 
1.53 
94.10 
1. 84 
.36 
2.33 
1.72 
94. 35 
L82 
.44 
3.03 
1.92 
93.60 
1.64 
.42 
2.55 
1. 96 
94. 07 
2.12 
.52 
Average. 
2.70 
1.78 
94.03 
1.85 
.44 
At the big elbow-bend in Oaknoxubee River, a quarter mile below 
e wagon bridge at Macon, the river has formed a bluff 75 feet 
gh on the south side of the stream. The entire cliff is made up of 
e Selma chalk. It is a solid mass of white chalk, nonfossiliferous, 
d apparently without bedding planes, but viewed at a distance the 
ratification of the material is shown by the unequal hardness of the 
rata, causing some to weather more rapidly than others. There is a 
arked dip to the south. All the smaller streams flowing into Oak- 
>xubee have channeled their beds into the pure white limestone. A 
mple was collected from the bluff on the Oaknoxubee River. 
The following analysis of this sample was made by H. C. McNeil in 
e laboratory of the United States Geological Survey: 
Analysis of Selma limestone from near Macon, Miss. 
ica (Si0 2 ) 9. 09 
umina (A1 2 3 ) \ ~ 4 - 
3n oxide ( Fe 2 3 ) J 
me carbonate (CaC0 3 ) 80. 99 
agnesium carbonate (MgC0 3 ) 00 
ater 1 . 08 
The town of Scooba is in the Flat woods area, which is underlain by 
ays of the Midway group. The road from Scooba to Dekalb is 
rough the Midway until Sucarnooche Creek is reached, 2 miles east 
Dekalb. The hills of the Laramie formation begin just west of 
e creek and rise 250 feet above the creek, barometric reading. 
The material here forming the Midway is a gray, plastic, nonfos- 
iferous clay ("popping clay"). It makes a cold soil, very sticky 
jpd plastic when wet, and when it dries out it cracks open so that one 
n thrust his hand 6 or 8 inches into the opening. 
But little of the Flatwoods area is cleared and put in cultivation, 
d this only where there is a little, remnant of Lafayette sand left, 
fee Lafayette formation is practically wanting over the entire area of 
le Flatwoods. 
Bull. 243—05 14 
